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Movement Ecology

Rocio Joo, Marie-Pierre Etienne, Nicolas Bez, Stéphanie Mahévas
In movement ecology, the few works that have taken collective behaviour into account are data-driven and rely on simplistic theoretical assumptions, relying in metrics that may or may not be measuring what is intended. In the present paper, we focus on pairwise joint-movement behaviour, where individuals move together during at least a segment of their path. We investigate the adequacy of twelve metrics introduced in previous works for assessing joint movement by analysing their theoretical properties and confronting them with contrasting case scenarios...
2018: Movement Ecology
Oskar Brattström, Anatoly Shapoval, Leonard I Wassenaar, Keith A Hobson, Susanne Åkesson
Background: Long-distance migration has evolved multiple times in different animal taxa. For insect migrants, the complete annual migration cycle covering several thousand kilometres, may be performed by several generations, each migrating part of the distance and reproducing. Different life-cycle stages and preferred orientation may thus, be found along the migration route. For migrating red admirals ( Vanessa atalanta ) it has been questioned if they reproduce in the most northern part of the range...
2018: Movement Ecology
Thomas Oudman, Theunis Piersma, Mohamed V Ahmedou Salem, Marieke E Feis, Anne Dekinga, Sander Holthuijsen, Job Ten Horn, Jan A van Gils, Allert I Bijleveld
Background: Space use strategies by foraging animals are often considered to be species-specific. However, similarity between conspecific strategies may also result from similar resource environments. Here, we revisit classic predictions of the relationships between the resource distribution and foragers' space use by tracking free-living foragers of a single species in two contrasting resource landscapes. At two main non-breeding areas along the East-Atlantic flyway (Wadden Sea, The Netherlands and Banc d'Arguin, Mauritania), we mapped prey distributions and derived resource landscapes in terms of the predicted intake rate of red knots ( Calidris canutus ), migratory molluscivore shorebirds...
2018: Movement Ecology
Benjamin J O'Neal, Joshua D Stafford, Ronald P Larkin, Eric S Michel
Background: Previous investigations of autumn-migrating ducks have reported weak connections between weather conditions and the decision to migrate from stopover sites. We leveraged relatively new weather surveillance radar technology to remotely detect departures of discrete groups of various species of migratory dabbling ducks ( Anatidae ) in autumn to more directly assess the effect of specific weather conditions on departure from discrete stopover sites. Methods: Using radar data collected over fifteen years (1995-2009), we documented a consistent phenomenon where a single, identifiable group departed from our study area on 30% of days during the autumn study period, and no ducks departed on the other days...
2018: Movement Ecology
Frances E Buderman, Mevin B Hooten, Mathew W Alldredge, Ephraim M Hanks, Jacob S Ivan
Background: While many species have suffered from the detrimental impacts of increasing human population growth, some species, such as cougars ( Puma concolor ), have been observed using human-modified landscapes. However, human-modified habitat can be a source of both increased risk and increased food availability, particularly for large carnivores. Assessing preferential use of the landscape is important for managing wildlife and can be particularly useful in transitional habitats, such as at the wildland-urban interface...
2018: Movement Ecology
Jade Vacquié-Garcia, Christian Lydersen, Rolf A Ims, Kit M Kovacs
Background: The Arctic is experiencing rapid reductions in sea ice and in some areas tidal glaciers are melting and retracting onto land. These changes are occurring at extremely rapid rates in the Northeast Atlantic Arctic. The aim of this study was to investigate the impacts of these environmental changes on space use by white whales ( Delphinapterus leucas ) in Svalbard, Norway. Using a unique biotelemetry data set involving 34 animals, spanning two decades, habitat use and movement patterns were compared before (1995-2001) and after (2013-2016) a dramatic change in the regional sea ice regime that began in 2006...
2018: Movement Ecology
Kristaps Sokolovskis, Giuseppe Bianco, Mikkel Willemoes, Diana Solovyeva, Staffan Bensch, Susanne Åkesson
Background: High-latitude bird migration has evolved after the last glaciation, in less than 10,000-15,000 years. Migrating songbirds rely on an endogenous migratory program, encoding timing, fueling, and routes, but it is still unknown which compass mechanism they use on migration. We used geolocators to track the migration of willow warblers ( Phylloscopus trochilus yakutensis ) from their eastern part of the range in Russia to wintering areas in sub-Saharan Africa. Our aim was to investigate if the autumn migration route can be explained by a simple compass mechanism, based on celestial or geomagnetic information, or whether migration is undertaken as a sequence of differential migratory paths possibly involving a map sense...
2018: Movement Ecology
Felix Liechti, Silke Bauer, Kiran L Dhanjal-Adams, Tamara Emmenegger, Pavel Zehtindjiev, Steffen Hahn
Background: Over the past decade, the miniaturisation of animal borne tags such as geolocators and GPS-transmitters has revolutionized our knowledge of the whereabouts of migratory species. Novel light-weight multi-sensor loggers (1.4 g), which harbour sensors for measuring ambient light intensity, atmospheric pressure, temperature and acceleration, were fixed to two long-distance migrant bird species - eurasian hoopoe ( Upupa epops ) and great reed warbler ( Acrocephalus arundinaceus )...
2018: Movement Ecology
Anne K Scharf, Jerrold L Belant, Dean E Beyer, Martin Wikelski, Kamran Safi
Background: Increases in landscape connectivity can improve a species' ability to cope with habitat fragmentation and degradation. Wildlife corridors increase landscape connectivity and it is therefore important to identify and maintain them. Currently, corridors are mostly identified using methods that rely on generic habitat suitability measures. One important and widely held assumption is that corridors represent swaths of suitable habitat connecting larger patches of suitable habitat in an otherwise unsuitable environment...
2018: Movement Ecology
Ben G Weinstein, Ladd Irvine, Ari S Friedlaender
Background: Matching animal movement with the behaviors that shape life history requires a rigorous connection between the observed patterns of space use and inferred behavioral states. As animal-borne dataloggers capture a greater diversity and frequency of three dimensional movements, we can increase the complexity of movement models describing animal behavior. One challenge in combining data streams is the different spatial and temporal frequency of observations. Nested movement models provide a flexible framework for gleaning data from long-duration, but temporally sparse, data sources...
2018: Movement Ecology
Pablo A E Alarcón, Sergio A Lambertucci
Telemetry-based movement research has become central for learning about the behavior, ecology and conservation of wide-ranging species. Particularly, early telemetry studies were conducted on vultures and condors due to three main reasons: i) these birds capture the curiosity of humans, ii) their large body size allows researchers to deploy large telemetry units, and iii) they are of high conservation concern. This has resulted in a great number of scientific articles that remain scattered throughout the literature...
2018: Movement Ecology
Kevin W Heist, Tim S Bowden, Jake Ferguson, Nathan A Rathbun, Erik C Olson, Daniel C Nolfi, Rebecca Horton, Jeffrey C Gosse, Douglas H Johnson, Michael T Wells
Background: Millions of flying migrants encounter the Great Lakes and other large water bodies on long-distance flights each spring and fall, but quantitative data regarding how they traverse these obstacles are limited. Shorelines are known areas of migrant concentration due to the ecological barrier effect, but details on the magnitude of this concentration and the flight behaviors causing it are largely unknown and difficult to quantify. Mobile avian radar can provide a unique view of how birds and bats move across landscapes by tracking thousands of individual migrants moving through a sample volume that extends multiple kilometers in radius...
2018: Movement Ecology
Zachary S Ladin, Steffie Van Nieuland, Solny A Adalsteinsson, Vincent D'Amico, Jacob L Bowman, Jeffrey J Buler, Jan M Baetens, Bernard De Baets, W Gregory Shriver
Background: Persistent declines in migratory songbird populations continue to motivate research exploring contributing factors to inform conservation efforts. Nearctic-Neotropical migratory species' population declines have been linked to habitat loss and reductions in habitat quality due to increasing urbanization in areas used throughout the annual cycle. Despite an increase in the number of studies on post-fledging ecology, generally characterized by the period between fledging and dispersal from natal areas or migration, contextual research linking post-fledging survival and habitat use to anthropogenic factors remains limited...
2018: Movement Ecology
Manuel Roeleke, Tobias Teige, Uwe Hoffmeister, Friederike Klingler, Christian C Voigt
Background: Animals change their habitat use in response to spatio-temporal fluctuation of resources. Some resources may vary periodically according to the moonphase. Yet it is poorly documented how animals, particularly nocturnal mammals, adjust their use of space in response to the moonphase.Here, we asked if an obligate nocturnal mammal, the aerial-hawking common noctule bat ( Nyctalus noctula ), adjusts its 3-dimensional flight behaviour and habitat use to the lunar period. Using miniaturized GPS loggers, we recorded 3-dimensional flight tracks of N...
2018: Movement Ecology
Brian D Gerber, Mevin B Hooten, Christopher P Peck, Mindy B Rice, James H Gammonley, Anthony D Apa, Amy J Davis
Background: Characterizing animal space use is critical for understanding ecological relationships. Animal telemetry technology has revolutionized the fields of ecology and conservation biology by providing high quality spatial data on animal movement. Radio-telemetry with very high frequency (VHF) radio signals continues to be a useful technology because of its low cost, miniaturization, and low battery requirements. Despite a number of statistical developments synthetically integrating animal location estimation and uncertainty with spatial process models using satellite telemetry data, we are unaware of similar developments for azimuthal telemetry data...
2018: Movement Ecology
Adam F Parlin, Jessica A Nardone, John Kelly Dougherty, Mimi Rebein, Kamran Safi, Paul J Schaeffer
Background: Ectotherms are assumed to be strongly influenced by the surrounding ambient and environmental conditions for daily activity and movement. As such, ecological and physiological factors contribute to stimuli influencing navigation, extent of movement, and therefore habitat use. Our study focused on the intensity of activity (from acceleration data) and extent of movement (from GPS and thread trailing data) of Eastern box turtles ( Terrapene carolina carolina ) in a fragmented landscape near their northern population limit...
2018: Movement Ecology
Eric R Dougherty, Perry de Valpine, Colin J Carlson, Jason K Blackburn, Wayne M Getz
Background: Continued exploration of the performance of the recently proposed cross-validation-based approach for delimiting home ranges using the Time Local Convex Hull (T-LoCoH) method has revealed a number of issues with the original formulation. Main text: Here we replace the ad hoc cross-validation score with a new formulation based on the total log probability of out-of-sample predictions. To obtain these probabilities, we interpret the normalized LoCoH hulls as a probability density...
2018: Movement Ecology
Rachel Muheim, Heiko Schmaljohann, Thomas Alerstam
Birds use different compass mechanisms based on celestial (stars, sun, skylight polarization pattern) and geomagnetic cues for orientation. Yet, much remains to be understood how birds actually use these compass mechanisms on their long-distance migratory journeys. Here, we assess in more detail the consequences of using different sun and magnetic compass mechanisms for the resulting bird migration routes during both autumn and spring migration. First, we calculated predicted flight routes to determine which of the compasses mechanisms lead to realistic and feasible migration routes starting at different latitudes during autumn and spring migration...
2018: Movement Ecology
Yannis P Papastamatiou, Yuuki Y Watanabe, Urška Demšar, Vianey Leos-Barajas, Darcy Bradley, Roland Langrock, Kevin Weng, Christopher G Lowe, Alan M Friedlander, Jennifer E Caselle
Background: Central place foragers (CPF) rest within a central place, and theory predicts that distance of patches from this central place sets the outer limits of the foraging arena. Many marine ectothermic predators behave like CPF animals, but never stop swimming, suggesting that predators will incur 'travelling' costs while resting. Currently, it is unknown how these CPF predators behave or how modulation of behavior contributes to daily energy budgets. We combine acoustic telemetry, multi-sensor loggers, and hidden Markov models (HMMs) to generate 'activity seascapes', which combine space use with patterns of activity, for reef sharks (blacktip reef and grey reef sharks) at an unfished Pacific atoll...
2018: Movement Ecology
Alison A Kock, Theoni Photopoulou, Ian Durbach, Katya Mauff, Michael Meÿer, Deon Kotze, Charles L Griffiths, M Justin O'Riain
Background: Understanding white shark ( Carcharodon carcharias ) habitat use in coastal areas adjacent to large cities, is an important step when formulating potential solutions to the conservation conflict that exists between humans and large predatory sharks. In this study, we present the findings of a 2.5-year study of white shark occurrence and movement patterns adjacent to the City of Cape Town in False Bay, South Africa, with a focus on spring and summer months. Fifty-one white sharks were monitored annually at three offshore and twelve inshore sites by VR2 acoustic receivers, over 975 days from 1 May 2005 to 31 December 2007...
2018: Movement Ecology
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